using devise for authentication, omniauth too
_devise-d_ user model

Added a devise-based user model, and OmniAuth authentication for
Facebook and Twitter
added a really important notice to self

Didn't know that `be_valid` could be substituted and replaced with `be`.
Somehow it doesn't work with negated should (should_not)
use `expect` to get better English sentences
initial Devise configurations
Merge branch 'master' of https://github.com/yawboakye/88

* 'master' of https://github.com/yawboakye/88:
  added functionality to update manager's profile
  added ruby version to Gemfile
  added functionality for organic sign in
  added functionality for updating manager profile
  implemented organic sign up

Conflicts:
	app/controllers/places_controller.rb
	app/views/layouts/_header.html.erb
	app/views/layouts/application.html.erb
	config/routes.rb